The answer is:
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[C]: Mercury and Venus.
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Mercury would be "Planet A"; and Venus would be "Planet B".
Answer: New and improved technology
Explanation: With more development tools we can significantly decrease manual labor which then causes us to increase our production time. As we improve this technology we are able to shift to more commercial production producing more for our larger population rather than simply for oneself and or their family
Hope this helps
Answer:
No.for example the tunguska event in 1908.an asteroid entered the atmosphere,exploded and sent pieces flying down 3-6miles to the surface
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